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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_CURVECP_CIRCULAR_BUFFER_H_
#define NET_CURVECP_CIRCULAR_BUFFER_H_
#pragma once
namespace net {
// A circular buffer is a fixed sized buffer which can be read or written
class CircularBuffer {
public:
// Create a CircularBuffer with maximum size |capacity|.
explicit CircularBuffer(int capacity);
~CircularBuffer();
int length() const { return length_; }
// Writes data into the circular buffer.
// |data| is the bytes to write.
// |length| is the number of bytes to write.
// Returns the number of bytes written, which may be less than |length| or
// 0 if no space is available in the buffer.
int write(const char* data, int length);
// Reads up to |length| bytes from the buffer into |data|.
// Returns the number of bytes read, or 0 if no data is available.
int read(char* data, int length);
private:
int capacity_;
int head_;
int length_;
char* buffer_;
};
} // namespace net
#endif // NET_CURVECP_CIRCULAR_BUFFER_H_
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